The first ARC "command sets"

It was hiding. There was no sign of it in its assigned space. A shiver ran up my spine. Could it have been stolen...or even accidently thrown away? Nah...it wasn't a dark and stormy night... Naturally, it turned up behind three pallet loads of boxes - the last one we moved, of course. (The first four digits stenciled on the boxes is the year of acquisition.)

Gotta be here somewhere...

Finally it appeared. An innocuous wooden box with six wood screws in the plywood cover. Hardly the object of so much interest over the years.

The size is about right...

Correct type, at least. Funny - no other metal tags on any other components except the dynos.

Just another broadcast band receiver, no doubt.

Well, maybe there is another frequency or two here...all serial no. 1, too

Strange - no other indentifiers anywhere - just the ink stamped letters on the dynamotor shelf.


Mostly double ended tubes... But wait - that little shield is in a different place on the MF receivers!

Interesting design for a mica insulated tube socket. The audio output tube is apparently a prototype of the 12A6.

Fairly low voltage - 220vdc

Guess it's not an ARC-5 after all...

Sure doesn't look like my R-23...

These receivers are all that survive from a prototype made for the Navy for evaluation under a Confidential contract. They were donated by the well-known "Surplus Corner" author Gordon Eliot White, who rescued them from the attic of a closed dowm successor to the Aircraft Radio Corporation. Below is the connection diagram for that system.

System diagram for the entire receiver/transmitter system

Look for this first prototype of the command sets at your friendly neighborhood Udvar-Hazy Annex next time you go for bread and milk. If you're observant, you might also see one of the Eighth Air Force blind landing modifications, as well as the Naval Research Lab's experiment in crystal control of the ARA...

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